The movie named “Before the Flood” has been released in 2016, starring one of the famous artists of Hollywood, Leonardo DiCaprio; explores the topic of global warming and its effects on environment and people. Leonardo DiCapro narrates his own thoughts throughout the movie and explains how the world has changed over the past years. It can be noticed that the world has changed drastically from the past world. Recently the climate of the earth has changed drastically and this is affecting the nature and the climate. This movie also gives us some insights about America’s carbon tax which is actually helping to reduce the carbon emission rates.